This is not a duplicate of the regex question, as having an incidental answer to an unasked question elsewhere is not the same as a direct answer to a direct question.
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Myrddin EmrysFeb 21 '12 at 2:10

1 Answer
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This used to be possible. As far as I can tell, this capability has been removed. I suspect that they were uncomfortable with how easy it was to find lists of credit card numbers, phone numbers, and social security numbers using this function.